SN54LS668W и другие
| Компонент | Описание | Производитель | |
| SN54LS668 | SYNCHRONOUS 4-BIT UP/DOWN COUNTERS |
Texas Instruments |
 |
| SN54LS668FK | SYNCHRONOUS 4-BIT UP/DOWN COUNTERS |
Texas Instruments |
|
| SN54LS668J | SYNCHRONOUS 4-BIT UP/DOWN COUNTERS |
Texas Instruments |
|
| SN54LS668W | SYNCHRONOUS 4-BIT UP/DOWN COUNTERS |
Texas Instruments |
|